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5μm 10μm Figure 3.7: SEM image of an optimized electrode. Left: top down, 5000×; right: cross- section, 2500×. SEM was not only used for quality control and optimization, but also to investigate changes to the electrode structure during cycling. Micrographs of the sulfur electrode recorded at different SoC are presented in Fig. 3.8. More precisely, these are images of several similar electrodes removed from identical cells at different times during the formation and first discharge. The changes to the morphology are apparent: After the initial charge (activation) a film has formed on the entire electrode (Fig. 3.8b). During the first discharge, the film is temporarily removed to a great extent (Fig. 3.8c), but re-deposited before the end of the discharge (Fig. 3.8d). The results are comparable to those of Refs. [134, 135], both of which used a cell design without any polysulfide confinement. This is a strong indication that – despite the carbon coating – some of the sulfur can actually move around freely in the cell. In fact, this behavior can be explained nicely by the model as presented on pages 93ff. 42PDF Image | Lithium-Sulfur Battery: Design, Characterization, and Physically-based Modeling
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